Abstract
The theory of KH2PO4 developed by Yomosa and the present writer can be applied to the upper phase of NH4H2PO4 without any alteration. All the experimental data can be represented by the formulas of this theory. It is shown that this theory has a more general character than it appears as based upon Slater's model of KH2PO4, and, when applied to Rochelle salt, it is equivalent to Mueller's interaction theory. Some discussions on the phase change in NH4H2PO4 are given.

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